sliver_tree/_drop_zone_resolver library

Pure drop-target resolution for drag-and-drop reorder.

Resolution is a pure function of controller state, hovered-row geometry and the pointer position, so the full zone table is unit-testable without a widget tree, following the same split as the package's other render and logic collaborators.

This library owns the semantic drop-target model. Pixel concerns like indent-per-depth never enter resolution: the pointer's x arrives pre-mapped to a preferred DEPTH, and the resolved slot leaves as TreeDropTarget.gapVisibleIndex, a visible-order position.

Classes

DropZoneResolver<TKey>

Classifies a pointer position over a hovered row into a TreeDropZone and translates it to a semantic TreeDropTarget against current TreeController state.

TreeDropTarget<TKey>

Resolved semantic drop target for the current pointer position during a drag.

Enums

TreeDropZone

Where the pointer lies relative to a candidate drop-target row.